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Full text of "USPTO Patents Application 09887738"

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Abstract 


HANZ201 


A spring shaft (1) for cleaning pipelines consists of a coil spring (2) with windings (3, 
3 a, 3b, 3c) of spring steel and with a rotation axis (RA) and a spiral winding axis (WA). In 
order to give the spring shaft (1) a particular cleaning function, the windings (3, 3a, 3b, 3c) 
have at least on their outside (4) a cross section departing from the circular shape, with at 
least one edge (K) acting on the pipeline. At the same time it is possible to provide the 
outside (4) with at least one longitudinal groove (8) following the windings (3 c), or to 
configure the cross section of the windings (3 a, 3b) as a square whose outside edge (4a) runs 
parallel to the rotation axis (RA) or whose surface diagonal (4b) runs radially to the rotation 
axis (RA). Lastly, it is possible to provide the outside (4) with a profile (5) in which 
projections and grooves alternate. 


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